ZOOLOGY AND BOTANY, MIGKOSCOFY, ETC. 



429 



MICROSCOPY. 

 A. Instruments, Accessories, etc. 



W. Watson and Sons, Ltd., 313 High Holborn, London, W.C., 

 have recently issued a new edition of their Catalogue of Microscopes, 

 and in it are contained some new instruments, and modifications of 

 others. 



Among the improvements we note they have abandoned tlie system 

 of suspending the substage or condenser carrier from the under side of 

 the stage of the microscope, the undesirability of which was urged 

 nearly forty years ago by Mr. John May all, Jun., and by successive 

 microscopists since. 



The practice of extending the limb sufficiently far below the stage 

 for the frame of the substage or condenser carrier to be attached to it 



Fig. ].— "Bactil/ 



seems to have been followed in all the Watson microscopes, and it is 

 certainly a move in the right direction. 



A new microscope under the name of " Bactil " appears for the first 

 time in this catalogue. In the main its lines are those of the " Service " 

 microscope previously described in this Journal, but it is designed 

 especially for research work, and is fitted with a large body, 2 in. 

 diameter. The fine adjustment, which is worked by milled heads from 

 either side of the limb, has a drum with divisions upon it. The 

 mechanical stage, which is shown in position in fig. 1, and which is 

 known as the " Service" pattern, gives a range of 60 mm. horizontally 



